As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAD FUEL FLOW FLUCTUATIONS AND POWER SURGES (2-4 GPH). OCCURRED ON TAKEOFF AND WAS PROGRESSIVELY MORE NOTICEABLE AS ENGINE WARMED UP. POSSIBLE CAUSE WAS THE BUSHINGS THAT THE THROTTLE SHAFT GOES THROUGH BEING WORN CAUSING PLAY IN THROTTLE TO MIXTURE ADJUSTMENT AND SUBSEQUENT CHANGES IN FUEL/AIR RATIO AND INDUCTION LEAKAGE THROUGH WORN BUSHINGS. (X)